Method of making hydrosulfite solutions.



- I m i TED S ATES PATENT OFFICE.

PHILIP is. OL'ARK8ON. or BEvERLnNEw JERSEY, AssroNoa To HERMAN v A, METZ, or BROOKLYN, NEW YORK.

m5. and;

To all mama 'Trtdy concern:

' Be it known that I, PHILIP S. anal some I citizen of the United States, residing erly, in the county of Burlingtonan New Jersey, have invented certain new and at Bev- State of useful 1m rovement's in- Methods 'ofMaking Hydrosuli te Solutions; of which the followin isa specification.

1 his invention is a method of preparing solutions of hydrosulfites, the object of the invention being to obtain hydrosulfite solutions salts.

furous acid may be supplie as gaseous sulfur of greater strength and stability than are yielded-by the methods in useas, for-infacto results are. obtained with tris'odium phosp ate; but I may also use salts of similar character-as for instance, borax orsodiurn tungstate or the corresponding potassium To the mixture so repared the suldioxid, asa solution, or in the form of an acid -salt, the term sulfurous acid being herein,

. em loyed' to incIude-thereagent in these severa forms. The reaction proceeds in a satisfactory manner in respect totyield, and the solutions obtained I are relatively. .stable' Thus a solution prepared from zinc-dust and so'diumbisulfite in the usual mannerwill be I completely deco posed upon standing at or- .dinary temperatures exposed to the-air fora" period of two days, whereas a solution pre pared as herein described will not be fully decomposed by exposure-under similar condi-" tionsfor sevenidays.

" fite solution for the p My. rocess doesnot eonteniplate the addition f compounds to theprepared hydTOSulP but their additionto t e reducing agent or .'paste emploiyed for the-preparation of such .soIutibnsg.-

' t is. probable that the favorable effect of the salts' nentioned is due 1101311611 erl-loo OFIYMAKING HYDROSULFITE soLurioNs.

Specification of Letters Patent. I Application filed November 7, 1805. Serial No- 2B6.294.

acid mi salts of tribasic acids as have an alkaline reaction toward litmus. 5

The most satis' of a salt of. a

solutions which consists in reacting solutions which consists in reacting furous acid with zinc in presence of tnsodium phosphate, substantlally as described.

Patented July 31, 1906,

action in ipreventing or counteracting any injurlous e cot Which the presence of sulfurous ht otherwise have upon-the hydrosulfite a tion. Example: Forty-five parts of zinc-dust are mixed with one undred parts of Water in which fifty parts of trisodium phosphate crystals, Na PO .12H O, have been dissolved. To this is added five hundred and twenty-five arts s'odiu'm-bisulfite solution, 32Twaddell.

he mixture .is agitated frequently and the reaction is complete in about one hour. A slight riseofjternperature during the'progress ofv the reaction may be= disregarded. When the reaction is complete, the mixture ready formed or in process of formais allowed to stand and the cleanhydrosulfite solution is ready for use. The solution may betransformed. by. the usual methods into such salts of hydrosulfurous acid as may be desired, or it may be used at once for reducing indigo.

"I claim- 1.' The method of preparing hydrosulfite solutions which consists'in reacting upon sulfurousacid with areducin agent in presence I tribasic aci substantially as described. 1.1 f' 2. The method of preparing hydrosulfite upon sulfurous acid 'witha reducing agent in presence of analkali-metal salt of a ing an alkaline reaction tolitmus, substantially as described."

, 3; The method fof preparing hydrosulfite solutions whichconsists in reactin upon-sulfurous acid zinc in presence 0 an alkali- Inetal salt of a tribasic acid havin an alkaline reaction to litmus, substantia ly as described; v v 4. The method-of preparing hydrosulfite upon sul- In testimony whereof I affix my signature in presencebi two witnesses. osc of preserving it,

PHILIP. s; 'CLARKSON. Witnesses: 7

A. L. HACK, PAUL Losses;

tnbasic acid-hav- 

